HIU & Communal Heating
HIU No Hot Water in London & the M25
No hot water from an HIU is diagnosed in stages — primary supply, strainer, control valve, exchanger — so the right part is replaced first time. We cover hiu no hot water for homeowners, landlords, managing agents and commercial sites across every London borough and the wider M25. Engineer time is £120+VAT per hour with a one hour minimum, and parts are always quoted in writing before they are fitted.
Quick answer
Who provides hiu no hot water in London, and what does it cost?
London HVAC Pro provides hiu no hot water in London and the M25 using F-Gas certified engineers. Engineer time is £120+VAT per hour with a one hour minimum and no call-out fee, parts are quoted in writing before fitting, and same-day attendance is usually available. Call 07427 826446 to book.
More answers: faults and causes, service costs, areas we cover.
HIU No Hot Water explained
No hot water from an HIU is diagnosed in stages — primary supply, strainer, control valve, exchanger — so the right part is replaced first time.
- Primary supply confirmation: Electrical tests and isolation belong to a qualified person; repeated resetting should not replace fault investigation.
- DHW plate exchanger: Confirm the component identity and model-specific requirements before deciding whether adjustment, testing or replacement is appropriate.
- Control valve position: Compare the input reading, requested output and actual equipment response; an error code is a starting point, not a diagnosis.
- Flow switch or sensor: Compare the input reading, requested output and actual equipment response; an error code is a starting point, not a diagnosis.
Interpreting the reported fault
Inspection, routine maintenance, fault diagnosis and installation answer different questions. Describe the equipment and the outcome needed so the visit can be scoped appropriately rather than treating every request as a replacement job.
- Reported symptom: no hot water at all from a communal heating flat
- Record when the problem started and any recent changes
- Keep fault codes and model details for the assessment
Choose the right service scope
Inspection, routine maintenance, fault diagnosis and installation answer different questions. Describe the equipment and the outcome needed so the visit can be scoped appropriately rather than treating every request as a replacement job.
- Confirm equipment model and access before the visit
Labour and the work to be agreed
Engineer time is £120+VAT per hour with a one hour minimum. The time and materials required depend on the diagnosed fault and access. Ask for the repair scope, any additional parts and the return-to-service checks before proceeding.
- £120+VAT per hour, one hour minimum
- Confirm the parts and labour required for the specific fault
HIU No Hot Water across London
Related hiu & communal heating services
These faults often appear together — each service has its own page with costs and what we check.
HIU Servicing
The usual trigger for a call is an annual service due under the block maintenance schedule. Other signs worth …
Heat Interface Unit Servicing Contract
The usual trigger for a call is a block needing scheduled HIU maintenance across many flats. Other signs worth…
HIU Plate Heat Exchanger Replacement
The usual trigger for a call is hot water that has gradually got weaker and cooler over months. Other signs wo…
HIU Control Valve Replacement
The usual trigger for a call is heating or hot water stuck permanently on or permanently off. Other signs wort…
HIU Actuator Replacement
The usual trigger for a call is an actuator that buzzes, sticks or shows no drive. Other signs worth acting on…
HIU Strainer Cleaning
The usual trigger for a call is reduced flow and poor hot water caused by network debris. Other signs worth ac…
HIU No Heating
The usual trigger for a call is radiators cold while hot water still works, or both cold. Other signs worth ac…
Communal Heating Repair
The usual trigger for a call is a block with intermittent heating complaints across several flats. Other signs…
See every service on our plumbing and mechanical services index, or read about underfloor heating repair London.
Book hiu no hot water in London
Tell us what the system is doing and we will send an engineer with the right parts. £120+VAT per hour, one hour minimum.
Call 07427 826446Frequently Asked Questions
Engineer labour from £120 + VAT per hour, with a 1-hour minimum. Parts and materials are quoted separately before work begins.
What's included in HIU No Hot Water
- Review of the equipment and the outcome needed
- Inspection of condition and operation
- Recommendation of the right service scope
- Written quote before chargeable work
- Record of findings
- Refrigerant handling by F-Gas certified engineers, with records kept
How HIU No Hot Water works
- 1
Contact us
Describe the equipment and what you need it to do.
- 2
Visit
An engineer inspects the equipment and its operation.
- 3
Recommendation
The right scope is recommended: servicing, repair or installation.
- 4
Written quote
Any chargeable work is quoted before it starts.
- 5
Work and record
Approved work is carried out and recorded.
HIU No Hot Water prices
| Item | Price |
|---|---|
| Engineer labour | £120 + VAT per hour |
| Minimum charge | One hour |
| Parts and materials | Written quote before work starts |
See all rates on our prices page or read why customers choose us.
HIU No Hot Water: scope, checks and next steps
No hot water from an HIU is diagnosed in stages — primary supply, strainer, control valve, exchanger — so the right part is replaced first time.
What the reported symptom tells us
no hot water at all from a communal heating flat. Record when this occurs, what changed beforehand and whether other equipment is affected. These observations narrow the investigation; they do not prove which part has failed.
Choose the right service scope
Inspection, routine maintenance, fault diagnosis and installation answer different questions. Describe the equipment and the outcome needed so the visit can be scoped appropriately rather than treating every request as a replacement job.
What each check helps establish
- Primary supply confirmation
- Electrical tests and isolation belong to a qualified person; repeated resetting should not replace fault investigation.
- DHW plate exchanger
- Confirm the component identity and model-specific requirements before deciding whether adjustment, testing or replacement is appropriate.
- Control valve position
- Compare the input reading, requested output and actual equipment response; an error code is a starting point, not a diagnosis.
- Flow switch or sensor
- Compare the input reading, requested output and actual equipment response; an error code is a starting point, not a diagnosis.